nuclear stress test question

Hi! I have question about a nuclear stress test I had just recently. I am a 41y/o female. non-smoker, 170lbs. 5'10. Exercise sporadically. I have had what I consider borderline high cholesterol at 180-215. Triglycerides occasionally high at 250-350(last result was 116 however) I have been having some chest discomfort not seemingly related to anything. Nothing relieves the discomfort when I am having it. Mostly it is across my back and shoulders and somewhat in my chest. Anyway, it prompted a visit to my cardiologist just to make sure. I have a hx. of frequent PVCs (10,000/day). I am not aware of any significant family history of heart disease. I did fine on the resting nuclear part as well as on the treadmill. I reached my target heartrate with no chest pain or SOB. No EKG changes. However when I picked up a copy of my stress test report it said the exercise portion of the nuclear test was abnormal. It said "subtle distal anterior ischemia". Everything else was WNL. In your opinion, how likely is this to be a false positive considering my history? They have ordered a CT scan. Does this seem like an appropriate course of action?  What does it mean when they say "subtle?" Less likely I hope. Any opinion would be great.

[Cleveland Clinic]

You are at low risk for coronary artery disease ( based on age and risk factors), and have atypical chest pain. Hence any positive test will more likely be a false positive than represent true disease. The subtlety of the findings on the stress argues even more in this direction. A CT scan if negative will reaffirm the low likelihood of this test representing disease, and the workup will probably end there. However, if positive they will probably order a left heart catheterization. The cost of the CT and radiation exposure are higher than left heart catheterization, so I would probably proceed with this  if anything at all.
What was the number of Mets that you exercised? This could give you a very low  risk for coronary artery disease morbidity even in the presence of the 'positive' stress test. If you exercised more than 14 mets that I would personally not proceed with either a CT or left heart catheterization.

[momto2]

Thanks for your response. According to the stress report I did 10 mets. Stage 3. 14% Grade. Max HR was 165. Also on the imaging part it said the Transient ischemic dilatation index was 1.27(normal less than 1.15) I don't know what this means. Overall injecton fraction was 67%. Resting was only 56% however. I don't know if that is significant or not. Several years ago I did a stress test and it was 11 mets. I don't really understand what"mets" are. Further info would be great. Thanks.